Will it rain in
San Jose today?
Live hourly rain forecast and run verdict for San Jose, California, US.
Running in San Jose means enjoying Silicon Valley's mild Mediterranean climate — but winter rains and summer heat still play a role. Whether it's a foggy morning along the Guadalupe River Trail, a warm afternoon in Alum Rock Park, or a winter downpour, knowing whether to head out before you lace up matters. RainOrRun checks live conditions in San Jose right now and gives you an instant verdict — plus the best hourly window if the weather's on the fence. We'll also recommend the right gear for whatever San Jose's Bay Area weather is throwing at you today.
What to wear
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How often does it rain in San Jose?
San Jose records around 547mm of rain a year, spread across about 55 days — roughly 15% of all days, or 5 days in an average month. Rain is rarely the thing that stops a run in San Jose. You can plan a training week without building it around the forecast, and a packable jacket is more insurance policy than staple.
The wettest month is January, averaging 115mm across about 10 rainy days. The driest is June, with 1mm over roughly 0 days. Average lows bottom out around 6.7°C in February — long-sleeve and light-glove weather rather than full winter kit. At the other end, August averages 29.1°C highs — hot enough that early morning and evening are the sensible windows, and hydration matters more than waterproofing.
Those are ten-year averages, not a forecast. What actually matters on the day is the next twelve hours — which is what the live verdict and hourly strip at the top of this page are for.
| Month | Rainfall | Rainy days | Avg high | Avg low |
|---|---|---|---|---|
| January | 115mm | 10 | 15.2°C | 6.8°C |
| February | 83mm | 8 | 16.7°C | 6.7°C |
| March | 93mm | 10 | 17.8°C | 8°C |
| April | 36mm | 5 | 20.5°C | 9.5°C |
| May | 15mm | 3 | 23.4°C | 11.5°C |
| June | 1mm | 0 | 27.8°C | 14.1°C |
| July | 2mm | 0 | 28.9°C | 15°C |
| August | 1mm | 0 | 29.1°C | 15.5°C |
| September | 6mm | 1 | 28.4°C | 15.3°C |
| October | 30mm | 3 | 25.3°C | 13.2°C |
| November | 54mm | 6 | 18.6°C | 8.8°C |
| December | 111mm | 9 | 14.7°C | 6.7°C |
Historical data: Open-Meteo archive, 2015–2024. A “rainy day” means at least 1mm of precipitation.
Running in San Jose: common questions
Will it rain in San Jose today?
The forecast card at the top of this page shows San Jose's rain probability for the current hour, plus an hour-by-hour breakdown for the rest of the day, using live Open-Meteo data. Historically, San Jose sees rain on about 55 days a year, so on any given day there is roughly a 15% chance of some rain falling.
Is it a good day to run in San Jose?
RainOrRun scores the live San Jose forecast on rain probability, rainfall amount, temperature, wind speed and severe weather, then returns a single verdict: Go, Maybe, or Don't Bother. A Maybe means conditions are borderline and it is worth picking your window rather than skipping the run.
What is the best time to run in San Jose today?
The hourly strip above highlights the best single window of the day for San Jose — the hour combining the lowest rain probability with the most comfortable temperature. You can also check up to eight days ahead using the date picker if you are planning a long run or a race.
What should I wear running in San Jose today?
The gear section on this page updates with the live San Jose forecast: a waterproof jacket and peaked cap when rain probability goes above 40%, a thermal base layer and gloves below 8 degrees Celsius, and a high-vis vest when wind or low light make you harder to see.
What is the wettest month in San Jose?
January is the wettest month in San Jose, averaging 115mm of rain across about 10 rainy days. June is the driest, with around 1mm over roughly 0 days. Figures are ten-year averages covering 2015 to 2024.
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